The correct answer is the Type of batteries
Explanation:
In an experiment, it is normal the researcher modifies one variable, in this case, the number of batteries (independent variable), and this variable affects the variable tested, in this case, the brightness of the bulb (dependent variable).
However, other factors or variables should be constant to guarantee the results are reliable. In this context, one factor that the student should keep constant is the type of batteries he uses because this is not one of the main variables and therefore it is not expected he changes this on purpose or this is affected by other variables. Moreover, by making any change the experiment can be negatively affected. For example, batteries might differ in their power capacity this can affect the brightness of the bulbs.
Answer:
<h3>A, I think but I'm sure </h3>
Explanation:
ur welcomeee ♥️♥️
Answer:
Explanation:
The first part of question is about the height of the rock from which it falls and hit the ground with speed of 11 m/s. Lets find out that height.
We will use the formula,
As the initial velocity of the rock was zero.
Now we have to find the height from which the rock should be dropped and it's speed on hitting the ground should be 22 m/s.
Again we will use the same formula, same calculation but the value of velocity now should be 22 m/s.
Wegener thought that the continents were moving through the earth's crust, like icebreakers plowing through ice sheets, and that centrifugal and tidal forces were responsible for moving the continents.
On top of that, Wegener learned that related species, too small to swim the oceans, were found on different continents, as were similar fossils. ... The year after Wegener died, Arthur Holmes published his idea that thermal convection in the earth's mantle could cause continents to move.
Volume=400cm^3 = 0.0004m3
Density = mass / volume
(7.8*10^3 ) * 0.0004 = mass
Mass = 3.12 kg
Weight = mass * gravitational field strength
W = 3.12* 10
= 312 N